On 4/18/13 12:01 AM, Chris Albertson wrote:
If I read the paper correctly you can skip the choke ring if you mount the antenna on top of a 2 meter or longer mast. Iron pipe comes on 10 foot lengths. The choke ring is for portable survey antenna that can't be placed on tall rooftop masts. I think a 2 meter pole on a roof pretty much meets their criteria of multi path difference being over 10 meters.
yes.. multipath that is more than a chip away is generally filtered out by the PN tracking loop, so all you really worry about is multipath signals within a chip. For C/A code at 1 Mchip/sec, the chips are 300 meters long. If you're doing P/Y code, it's a tenth of that.
In reality, if the multipath signal is lower, and it's "far" away (a good fraction of a chip) it doesn't contribute much to the output of the correlator. So their 10 meter thing is probably a good number for a "typical" receiver they make.
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